21666666494822 has 8 divisors (see below), whose sum is σ = 32945205218376. Its totient is φ = 10684931422032.

The previous prime is 21666666494807. The next prime is 21666666494839. The reversal of 21666666494822 is 22849466666612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74200912508 + ... + 74200912799.

It is an arithmetic number, because the mean of its divisors is an integer number (4118150652297).

Almost surely, 2^{21666666494822} is an apocalyptic number.

21666666494822 is a deficient number, since it is larger than the sum of its proper divisors (11278538723554).

21666666494822 is a wasteful number, since it uses less digits than its factorization.

21666666494822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148401825382.

The product of its digits is 429981696, while the sum is 68.

The spelling of 21666666494822 in words is "twenty-one trillion, six hundred sixty-six billion, six hundred sixty-six million, four hundred ninety-four thousand, eight hundred twenty-two".